Author Archive

EMC Symmetrix – DMX Models by Cabinets Types

December 6th, 2008 1 comment

The below is the true breakdown of the type of the EMC Symmetrix and EMC DMX machines to the type of cabinet properties it has. 

Starting with the Symm 3.0’s EMC introduced a 1/2 Hieght cabinets, Single Full Cabinet and a 3 Cabinet machine. The same ideas went into the Symm 4.0 and 4.8. 

Starting the Symm 5.0 and into Symm 5.5, EMC introduced the Badger cabinets, which where much slimmer and about 5 ft in height, it was a disaster with those cabinets. Really no one bought it. 

Starting the DMX800’s and DMX1000’s which are the single cabinet, EMC introduced the DMX2000’s in 2 cabinets and DMX3000 in 3 cabinet style. 

Also if you ever wondered where those Symm modell numbers came from

1st Digit: 3 = Open Systems. 5 = Mainframe. 8 = Mixed.
2nd Digit: Related to Cabinet size, dependant on Generation’
3rd Digit: 00 = 5¼” Drives. 30 = 3½” Drives              

The DMX uses 31/2″ Fiber Drives

About me, this blog, my work, the ideas and vision…

December 6th, 2008 19 comments

Greetings from Cold New Jersey today!!!!

Had a long busy week: To sum up some of the activities, Pre Sales Conference calls with Customers, some team review meetings, some new employee interviews, management meetings, meetings with internal marketing teams for documentation creation, vendor meetings with some technology solution providers and had to attend 3 escalation calls.

It was action packed week but the matter of truth is, it was great, it keeps the adrenaline going.

With some travel restrictions in place, atleast the good thing is, I get to spend some quality time in the office taking care of normal day to day business. Next week is again back to travelling going Atlantic City, Atlanta and Boston. All for customer meetings, partner training and win some new business.

Sometimes staying away from the family is not the best thing either. We live in NJ and my wife is a stay home mother these days taking care of our 3 year old daughter.


With more than 7 Years of IT experience, Devang is currently the Director of Technology Solutions and IT Operations. Devang has held several positions in the past including Sr. Systems Engineer, Sr. Network Engineer, Technical Support Manager, Director of Storage Support & Operations. He has been responsible for creating and managing worldwide technical support teams, technology solutions team, operations management, service delivery, pre and post sales support, marketing and business planning. In his current role Devang oversees multiple aspects of the Technology Solutions Group that works with various Multinational and Fortune 500 companies providing them infrastructure services. Along with various industry certifications, Devang holds a Bachelor of Science from South Gujarat University, India and a Master’s of Science in Computer Science from North Carolina A&T State University.


This blog started as more of a project to put some technical information together. I never thought I would be able to write so much or be able to think creatively to put this information together. Started writing some small articles on the internal company blog to see how I did, now it takes about an hour or two to write a major blog article. Also about 8 months ago when I started the Data Storage Professionals group on Linkedin, I really thought there should be a place for all the group members to go and read technical information regarding Storage. I would eventually like to add more modules on to the blog allowing users to post updates, discussions, jobs, etc.

Since I started writing blogs on this site, I came across blogs of Chuck Hollis from EMC, Dave’s Blog from NetApp, EMC Storage Product Info from Diwakar, Information Playground from Steve Todd, Storage Architect from Chris Evans and StorageMojo from Robin Harris.

Believe it or not, I really like articles from Chuck Hollis even though the industry has been a critic of him, he does have futuristic ideas and his blogs are very pro EMC.

The drawback reading most of the bloggers is everyone pretty much talks about the technology or the OEM they work for and not necessarily say positive things about other bloggers from competition OEM’s technology.

Chris Evans is really good on the Storage Architect Blog, Diwakar is very technical on the EMC Storage Product Info Blog and I enjoy reading his blogs. Robin Harris doesn’t have to say good about any of the OEM’s, but it is good to read an independent person.

Couple of weeks ago, from Chris Evans’ Blog I ran into the blog of Martin Glassborow, the StorageBod. I have been really impressed by his writings.

So when I started blogging I decided I wanted to keep this blog about technical data rather than talking about industry storage throat cutting practices or write positive or negative about other bloggers.

So far I have kept a positive approach on my thoughts and have pretty much stayed with my ideas of where I would like to see this go over the next several months.

I see a lot of visits on this blog from all over the world and have been amazed with the response the readers have given me with comments and / or emails. The subscriptions and visits on the blog go up everyday wanting me to write more about the technology and data I have had experience in over all these years.

With my work schedule at times, it’s very hard for me to be able to think creatively and sit and write something for an hour or so. I normally like to keep my blogging after work hours and on weekends to keep my creative thinking and creative writing going. I have been visiting websites of many technology and solutions providers to understand what and how they work with storage and have been writing some blogs about them as well to describe their practices and solutions.

I had committed myself to write 4 blogs a week, but I rarely have time to do that. I think going forward I will atleast try to keep it to 2 to 3 blogs a week if possible.

One day I ran across youtube storage videos where I saw all these users posting EMC, NETApp, 3Par, Pillar Data, HP EVA, HDS related videos, and I thought it would be a good idea to have a link from my blog to these videos for users to be able to learn and understand these technologies.


I started working at Telcordia Technologies about 7 years ago, believe it or not as a Network Engineer.  Worked with a great group of people, I had guys in the teams that were the intial group of people that had invented SONET. Every other guy you walk by had a Phd in something or the other. That was short lived and then I moved to Computer Data Source, Inc and have been working there for about 6 years now.

As work started getting busy for me in the early years, new challenges kept on coming and I excelled at all of them, but back in my mind I always had known I had to keep myself creative and abreast with the latest industry trends; while growing both my managerial and technical skills.

The biggest challenge in this industry is to keep a balance with innovativeness, management, sustaining growth, lifestyle improvement, being competitive, building a professional network, get way from repetitive day to day activities and being creative. When you are expecting for such a well balanced and fine tuned work life, things sure become complex and challenging.

Being able to grow in this market has a lot to do with my early childhood, mind set of being in competitions, educational background, my sports background with roller skates, project management skills, technical skills, ideas and vision. A combination of the above has brought me much closer to my goals.

So the storage journey for me started about 5 years ago, believe it or not until the first 4 years, I never even realized I was in the storage industry. Until earlier this year I started meeting up with some Storage Experts, Technology Consultants and Storage Architects. That’s when the light bulb really went on that I had been in this industry working with a ton of customers doing pre sales support, post sales support, creating and writing marketing documents, writing white papers, doing performance analysis, creating a team of worldwide support engineers, growing the business in various countries in different continents, providing training, providing escalation support, managing service delivery through out the world, being able to understand the technology and pitch it to the customers in terms of savings, interfacing developers to help manage and lead the technology, working with financial folks to delivery numbers in terms of profits back to the organization and the knowledge I had gained in this industry was much beyond what I thought I really had. That is when a real shift in my work life began with wanting to do new things that we had never even attempted to do before.

Working for an Independent Service Provider life is always challenging, working with limited technology, limited resources, limited documents, no engineering support and being able to provide services to meet or beat the OEM standards at a fraction of a cost…… is a big challenge to delivery and keep the business expansion in place.

Now the philosophy has really changed, think working for a Independent Service Provider is great, but the idea is to work with OEM’s on bleeding edge technology to further promote growth in the organization.

These days, I am out on a new venture to do great things, I wish in a long run it all works out. I hate to be cryptic like this, but I believe as we start going to the market with the plans we have and with the work we do, we will be able to become leaders in that vertical market space. Blogging has a lot to do with this change which I realized earlier this year. Now I do feel to be very creative and enthusiastic about the success forthcoming.

Success, Industry, Ideas, Vision:

SUCCESS & GROWTH: Business Vision, Challenges, Innovativeness, Creativity, Teamwork and Goals have everything to do with this. Oh…… I forgot the most important things —- HARDWORK AND PERSISTENCE. Success is not imminent, it comprises of the above, if there is any compromise you will very easily get swayed away from your targets and goals.

Early in the days the team I headed, we all realized these were very important aspects of our success, we kept these things in mind and kept working hard. 5 Years in the making now the business growth is phenomenal, the partnerships we created are a jubilant and the customers we have are our diamonds. Again it wouldn’t have happened without all the components of success and teamwork put together.

The succeed in this market place it is required to work closely and form teamwork not only in the team you head but with other teams (like Sales, Marketing, Engineering) that are key components of your end results.

We kept on achieving targets and setting up new goals that were unreachable, but at the end of the period, we had always exceeded them.

I do want to keep blogging and work with Storage industry leaders to bring some new ideas and visions on the table.

This is a real time for OEM’s to work together to create industry standard practices rather than throat cutting tactics. Customers today are proving that by going way from their homogenous storage to heterogeneous storage platforms. If we do not do anything about it today, this industry will be segmented like the automakers here in US. We sometimes forget the innovations and go after marketing tactics to throw other OEM’s out, may be in a long run it just hurts the industry.

With all new technologies coming out to the market these days, no single OEM can combine all of those together in a single piece of hardware or software neither can the customer use one homogenous technology to solve all their business problems. It is very important to promote and support cross platform technologies to help the customer resolve their pain points…..

Veritas Terms and Definitions

December 3rd, 2008 No comments

Term & Definition

Disk group:
Collection of data, volumes, and associated parts (subdisks, plexes, and vmdisks).

Virtual partition on which filesystems are created or databases operate.

Data plex:
1 copy of the data.

Log plex:
Logging information for volumes (RAID 5 or DRL). Displayed with a double border.

Contiguous regions on a disk. 4096 is the limit on the number of subdisks per physical volume.

VM Disks:
Public region of a physical disk.

Merging Fiber Channel Fabrics

December 3rd, 2008 No comments

You have two fabrics running off of two switches. You’d like to make them one fabric. How to do that? For the most part, it’s simply connecting the two switches via e_ports.

Before doing that, however, realize there’s several factors that can prevent them from merging

1. Incompatible operating parameters such as RA_TOV and ED_TOV
2. Duplicate domain IDs.
3. Incompatible zoning configurations
4. No principal switch (priority set to 255 on all switches)
5. No response from the switch (hello sent every 30 seconds)

To avoid the issues above:

1. Check IPs on all Service Processors and switches; deconflict as necessary.
2. Ensure that all switches have unique domain ids.
3. Ensure that operating parameters are the same.
4. Ensure there aren’t any zoning conflicts in the fabric (port zones, etc).

Once that’s done:

1. Physically link the switches
2. View the active zone set to ensure the merge happens.
3. Save the active zone set
4. Activate the new zone set.